定子匝间故障的双馈风力发电机组的建模与最大风能追踪研究

摘要

As the common and internal fault of doubly-fed induction generator, inter-turn short circuit fault of stator windings directly affects the safe and stable operation of doubly-fed wind power generation system. Firstly, the mathematical model of a doubly fed induction generator taking into the consideration of stator winding inter-turn short circuit was built, and its simulation model based on the theory of multi-loop in MATLAB/Simulink environment was established. Then, the simulation module was connected to the infinite power system. Afterwards, it has been verified its correctness. In the condition of different degrees of stator winding inter-turn short circuit, when the wind speed changed, its ability to achieve maximum wind energy tracking by the dynamic operation of the fault motor was analyzed. Finally, the results showed that DFIG with the SWITSC fault couldn't achieve the maximum wind power tracking;with the deepening of the stator winding inter turn short circuit, the ability of DFIG with SWITSC to achieve the maximum wind energy tracking becomed weaker.%定子匝间短路故障作为双馈风力发电机一种常见的内部故障,直接影响双馈风力发电系统的安全、稳定运行. 首先建立了双馈感应发电机( DFIG)发生定子绕组匝间短路( SWITSC)的故障数学模型,并基于多回路理论在MATLAB/Simulink环境下搭建了其仿真模块,验证了其正确性. 之后,将搭建的仿真模块连接到无穷大电网中进行仿真. 在风速变化时,不同匝间短路程度下,该故障电机的动态运行状况,分析其能否实现最大风能追踪. 最后,结果表明:发生定子匝间短路故障的双馈风力发电机组不能很好地实现最大风能追踪;且随着短路程度的加深,发生定子匝间短路故障的双馈风力发电机实现最大风能追踪的能力变得更弱.